Answer: 4000
Step-by-step explanation:
Let the number be x.
According to the given , we have the following equation:
0.9% of x = 36
Convert 0.9% into decimal number by dividing it by 100 and replace of by multiply sign, we get

Multiply 100 on both the sides , we get

Divide both the sides by 0.9 , we get

Hence, the required number is 4000.